HID: merged HID_Descriptor into HIDDescriptorListNode

This simplifies the object model and produce a small gain in code size and performance.

Author: cmaglie

libraries/HID/HID.cpp

@@ -68,7 +68,7 @@ int HID_GetDescriptor(int8_t t)
 HIDDescriptorListNode* current = rootNode;
 int total = 0;
 while(current != NULL) {
-total += USBD_SendControl(0,current->descriptor->data,current->descriptor->length);
+total += USBD_SendControl(0,current->data,current->length);
 current = current->next;
 }
 return total;
@@ -89,7 +89,7 @@ void HID_::AppendDescriptor(HIDDescriptorListNode *node)
 current->next = node;
 }
 modules_count++;
-sizeof_hidReportDescriptor += node->descriptor->length;
+sizeof_hidReportDescriptor += node->length;
 }
 
 void HID_::SendReport(uint8_t id, const void* data, int len)

libraries/HID/HID.h

@@ -42,16 +42,12 @@
 #define HID_REPORT_DESCRIPTOR_TYPE 0x22
 #define HID_PHYSICAL_DESCRIPTOR_TYPE 0x23
 
-typedef struct __attribute__((packed)) {
- uint8_t length;
- const void* data;
-} HID_Descriptor;
-
 class HIDDescriptorListNode {
 public:
  HIDDescriptorListNode *next = NULL;
- const HID_Descriptor *descriptor;
- HIDDescriptorListNode(const HID_Descriptor *d) : descriptor(d) { }
+ HIDDescriptorListNode(const void *d, uint16_t l) : data(d), length(l) { }
+ uint8_t length;
+ const void* data;
 };
 
 class HID_